The results of VHF ionospheric scatter measurements made in the European-Mediterranean area are shown to be in good agreement with results obtained in continental United States.Sporadic-E propagation was observed much more frequently in the EuropeanMedite Topic: Ionospheric radio wave propagation.
byESSA/ARPA Symposium on Acoustic-Gravity Waves (1968 : Boulder, Colo.); Georges, T. M. (Thomas Martin), 1938-; United States. Environmental Science Services Administration; United States. Advanced Research Projects Agency
"Sponsored by the Environmental Science Services Administration and the Advanced Research Projects Agency." Topic: Ionospheric radio wave propagation.
Support Material for the Radio Wave Propagation 2008/2009 course from the integrated master degree in Electrical and Computer Engineering froum IST. General Objectives This course intends to complement basic information on telecommunications previously received by the students. It introduces the physical mechanisms along with theoretical models for a proper characterisation of the propagation channel. This subject is relevant for understanding and designing all types of wireless systems, taking... Topic: Radio Wave Propagation
byDresp, M. R.; Mitre Corporation; United States. Air Force. Systems Command. Electronic Systems Division. Deputy for Planning and Technology
"A full-wave solution has been obtained for radio wave propagation in the presence of an elevated tropospheric layer. This analysis was performed as part of the CNI (Communication, Navigation, Identification) experimental program. The tropospheric layer is modeled as a trilinear refractive index profile with a sufficient lapse rate so as to result in an elevated duct. The analytical solutions give the received signal level for air-to-air propagation paths at UHF, the corresponding signal... Topics: Radio Propagation, Ionospheric radio wave propagation, Tropospheric Ducting, Radio Wave...
byMenzel, Donald H.; Smith, Ernest K., Jr. (editors)
Contents:Microscopic theory of ionospheric cross-modulation; Ionospheric wave interaction using gyro-waves.Part 1.The night-time lower E-region; Wav * e interaction at oblique incidence, near the gyro frequency; Non-linear propagation of electromagnetic w Topics: Ionosphere--Congresses., Ionospheric radio wave propagation--Congresses.
Extensive numerical results are presented for the reflection coefficient of a horizontally stratified ionized medium. The profiles of electron density and the collision frequencies are both taken to be exponential functions. The d-c magnetic field is ta Topics: Electromagnetic waves., Ionospheric radio wave propagation.
The principal results of this technical note are graphical presentations of the attenuation rates, phase velocities, and excitation factors for the dominant modes in the earth-ionosphere waveguide.The frequency range considered is 8 kc/s to 30 kc/s. *The Topics: VLF emissions., Ionospheric radio wave propagation.
NBS monograph 80. Contents Chapter 1 The Earth's Atmosphere, Geomagnetism, and the Sun 1.1. Nomenclature 1 1.2. Pressure and Density Variations 2 1.3. Chemical Composition 5 1.4. Formation of Ionized Layers 8 1.4.1. Ion Production 8 1.4.2. Ion Disappearance 8 1.4.3. Formation of a Chapman Layer 12 1.4.4. Electron Density Distribution 17 1.5. The Earth's Magnetic Fields 19 1.5.1. The Dipole Field 19 1.5.2. The Real Field 23 1.5.3. Magnetic Variations 26 1.5.4. Magnetic Indices 30 1.6. The... Topics: Ionospheric Radio Wave Propagation, NBS monograph, Ham Radio, Amateur Radio, DXing, Radio...
byJanes, H. B.; Kirkpatrick, A. W.; Waters, D. M.; Smith, D.
Propagation measurements at 9.4 and 9.2 Gc/s were made over a 47 km, line-of-sight, over-water path at Eleuthera Island in the Bahamas.The purpose was to study the signal amplitude and phase variations at the two frequencies, and in particular, the variat Topics: Shortwave radio--Transmitters and transmission., Tropospheric radio wave propagation.
This technical memorandum is a mathematical investigation of the problem of overspeeded disks. New methods must be sought for obtaining a satisfactory stress equalization in the cross section of these disks. Topics: LEAKAGE, COMBUSTION, VALVES, PRESSURE EFFECTS, WAVE PROPAGATION, FLOW VELOCITY
In an optical fiber having NA greater than 1, light may be internally reflected when it strikes the fiber end at a fiber-air interface. This problem may be overcome by modification of the fiber by reverse tapering the core. Light is redirected by the taper to strike the interface at an angle closer to normal. This allows light to exit the fiber end that would by internally reflected in an untapered fiber of NA greater than 1. The novelty of the present invention lies in the tapering of the... Topics: WAVE PROPAGATION, ACOUSTIC DUCTS, UNIFORM FLOW, MICROPHONES, MACH NUMBER
A collection of titles and abstracts is presented for articles dealing with the microwave fading that has been observed on tropospheric line of sight paths.Selections are included for related subjects such as:measurement of meteorological factors; spatial Topics: Tropospheric radio wave propagation--Bibliography., Radio waves--Bibliography.
HAARP High Power Experiments And Observations Of Ionospheric Interactions by Rodriguez, Paul; Kennedy, Edward; Kossey, Paul; Kaiser, Michael; Bougeret, Jean-Louis; Kurth, William; Bristow, William."We review experiments in ionospheric modification and long distance propagation performed at the HAARP facility. Most experiments were in bistatic configuration with the WAVES receiver on the NASA/WIND satellite. Initial experiments showed scintillation-like variations in low frequency... Topics: HAARP, Ionospheric modification, Radio propagation, Ionospheric scintillation, Radio Wave...